03_aarch64

LibGolf

Example: AARCH64

This is an example for aarch64 shellcode - tested on a PinePhone.

Instructions

• Build the binary with make
• Run aarch64.bin on a 64-bit ARM platform (e.g. a PinePhone)
• Check the return value with echo $? - it will be 0

Details

In shellcode.h is ARM shellcode which calls sys_exit with return value 0.

mov x0, #0      @ Return value is 0
mov x8, #0x5d   @ 0x5d is sys_exit
svc #0          @ Interrupt to svc mode (syscall)

This gives the bytes 00 00 80 d2 a8 0b 80 d2 01 00 00 d4, and forms the .text segment of the binary (see from offset 0x78 onwards below).

Note that the bytes of each instruction are reversed for aarch64 platforms.

00000000: 7f45 4c46 0201 0100 0000 0000 0000 0000  .ELF............
00000010: 0200 b700 0100 0000 7800 4000 0000 0000  ........x.@.....
00000020: 4000 0000 0000 0000 0000 0000 0000 0000  @...............
00000030: 0000 0000 4000 3800 0100 0000 0000 0000  ....@.8.........
00000040: 0100 0000 0500 0000 0000 0000 0000 0000  ................
00000050: 0000 4000 0000 0000 0000 4000 0000 0000  ..@.......@.....
00000060: 0c00 0000 0000 0000 0c00 0000 0000 0000  ................
00000070: 0000 0100 0000 0000 0000 80d2 a80b 80d2  ................
00000080: 0100 00d4                                ....

Customizations

None required.